Use transaction to 'SHOW WARNINGS'. Fixes #918

Author: bgrainger

src/MySqlConnector/MySqlConnection.cs

@@ -812,8 +812,9 @@ internal void FinishQuerying(bool hasWarnings)
 			{
 				var errors = new List<MySqlError>();
 				using (var command = new MySqlCommand("SHOW WARNINGS;", this))
-				using (var reader = command.ExecuteReader())
 				{
+					command.Transaction = CurrentTransaction;
+					using var reader = command.ExecuteReader();
 					while (reader.Read())
 						errors.Add(new(reader.GetString(0), reader.GetInt32(1), reader.GetString(2)));
 				}

tests/SideBySide/ConnectionTests.cs

@@ -40,6 +40,30 @@ public void GotInfoMessageForNonExistentTable()
 			Assert.True(gotEvent);
 		}
 
+		[Fact]
+		public void GotInfoMessageForNonExistentTableInTransaction()
+		{
+			using var connection = new MySqlConnection(AppConfig.ConnectionString);
+			connection.Open();
+			using var transaction = connection.BeginTransaction();
+
+			var gotEvent = false;
+			connection.InfoMessage += (s, a) =>
+			{
+				gotEvent = true;
+#if BASELINE
+				Assert.Single(a.errors);
+				Assert.Equal((int) MySqlErrorCode.BadTable, a.errors[0].Code);
+#else
+				Assert.Single(a.Errors);
+				Assert.Equal((int) MySqlErrorCode.BadTable, a.Errors[0].Code);
+#endif
+			};
+
+			connection.Execute(@"drop table if exists table_does_not_exist;", transaction: transaction);
+			Assert.True(gotEvent);
+		}
+
 		[Fact]
 		public void NoInfoMessageWhenNotLastStatementInBatch()
 		{